Fertilization modulation compounds and process for implementing them

1. A method for treating sterility, or for promoting or improving fertilization, or for promoting or improving a viable embryogenesis comprising the steps of: treating a sample comprising spermatozoa in vitro with a therapeutically effective amount of a mammalian group X secreted phospholipase A2 (group X sPLA2) to target inefficient spermatozoa and trigger an early acrosome reaction on said inefficient spermatozoa in the absence of oocytes, and contacting said group X sPLA2-treated spermatozoa sample with an oocyte having zona pellucida, wherein said in vitro treatment of spermatozoa results in enrichment of efficient spermatozoa and improved fertilization.

2. The method according to claim 1 , wherein the method treats sterility, promotes or improves fertilization, or promotes or improves viable embryogenesis in a mammal.

3. The method according to claim 2 , wherein the method treats a female mammal undergoing in vitro fertilization procedure (IVF), gamete intrafallopian transfer procedure (GIFT), intracytoplasmic sperm injection procedure (ICSI), or therapeutic donor insemination procedure (TDI) during assisted reproductive technologies (ART).

4. The method according to claim 2 , wherein said group X sPLA2 hydrolyse hydrolyzes the sn-2 ester of one or more anionic and zwitterionic glycero-phospholipids with a specific activity of from about 1 μmol/min/mg to about 50 μmol/min/mg.

5. The method according to claim 2 , wherein said group X sPLA2 hydrolyzes the sn-2 ester of one or more anionic and zwitterionic glycero-phospholipids with a specific activity of from about 1 μmol/min/mg to about 50 μmol/min/mg, wherein said glycero-phospholipids are selected from the group consisting of: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG), 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), and 1 palmitoyl-2-oleoyl-sn-glycero-3-phosphoserine (POPS).

6. The method according to claim 2 , wherein said group X sPLA2 hydrolyzes the sn-2 ester of one or more anionic and zwitterionic glycero-phospholipids with a specific activity of from about 1 μmol/min/mg to about 50 μmol/min/mg and said glycerol phospholipids being selected from the group consisting of: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG), 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoserine (POPS), wherein the specific activity towards POPG is from about 1 to about 50 μmol/min/mg, and/or the specific activity towards POPC is from about 1 to about 25 μmol/min/mg, and/or the specific activity towards POPS is from about 1 to about 50 μmol/min/mg.

7. The method according to claim 2 , wherein said group X sPLA2 is at a concentration from about 0.2 nM to about 200 nM.